From: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Date: Tue, 21 Sep 2010 14:03:26 +0000 (+0100)
Subject: ASoC: Fix soc-cache buffer overflow bug
X-Git-Tag: v2.6.36-rc8~16^2^2~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d47372e852391d0c6553dfbc7c4c56b89b527e13;p=platform%2Fkernel%2Flinux-3.10.git

ASoC: Fix soc-cache buffer overflow bug

Make sure we stay within the cache boundaries when updating the
register cache.

Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---

diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c
index adbc68c..15d2779 100644
--- a/sound/soc/soc-cache.c
+++ b/sound/soc/soc-cache.c
@@ -203,8 +203,9 @@ static int snd_soc_8_16_write(struct snd_soc_codec *codec, unsigned int reg,
 	data[1] = (value >> 8) & 0xff;
 	data[2] = value & 0xff;
 
-	if (!snd_soc_codec_volatile_register(codec, reg))
-		reg_cache[reg] = value;
+	if (!snd_soc_codec_volatile_register(codec, reg)
+		&& reg < codec->driver->reg_cache_size)
+			reg_cache[reg] = value;
 
 	if (codec->cache_only) {
 		codec->cache_sync = 1;